Like most 1965 GT350's, 5S159 was originally produced as one of only 525 street model Shelby Mustangs. It was converted to a race prepared car in 1976 by Donald G. Cummings of Ormond Beach, FL. Its first race was the Paul Revere 250 at Daytona, driven by Donald Cummings and Guido Levetto. It finished in 28'th place. The Paul Revere race was used as a test bed in preparation for the legendary endurance race in Daytona Beach.

In 1980, Cummings and Levetto drove 5S159 at the 24-Hours of Daytona and finished in 28'th place. The car was raced under sponsorship of 'The Cummings Marque Inc.', named for the body shop owned by Donald Cummings. By placing 28'th, 5S159 became only the second Shelby Mustang to finish the 24 Hours of Daytona. The other car was also owned and campaigned by Donald Cummings.